Cylinder-cock.



UNITED STATES Patented December 13, 1904.

PATENT OEEICE.

CHARLES BRANDON ALVIS, OF LAS VEGAS, TERRITORY OF NEW MEXICO.

CYLINDER-COCK..

SPECIFICATION forming part of Letters Patent No. 777,364, dated December 13, 1904,

i Application filed June 8, 1904.-. Serial No. 211,630. (No model.)

To (Jl/ZZ whom, 'llt may concern:

Be it known that I, CHARLES BRANDON ALvIs, a citizen of the United States, and a resident ot' Las Vegas, in the county oi San Miguel and Territory of New Mexico, have invented a new and Improved Cylinder-Cock, of which the t'ollowing is a full, clear, and exact description.

My invention relates to cylinder-cocks, it being especially applicable to the cylinders of compound locomotives. Its principal objects are to provide means whereby the engineer may open communication between the ends of the cylinder and the atmosphere upon starting and which will also vent any undue cxcess of pressure while running.

lt consists in the various features and combinations hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this speciiication, in which similar characters of reference indicate corresponding parts in all the ligures.

Figure 1 is a side elevation of the cylinders of a tandem compound locomotive, to the lowpressure cylinder of which one embodiment ot' my invention is applied, parts being broken away and in section. Fig. 2 is a side elevation of my improved cylinder-cock, tog'ether with a portion of the coacting operating-rod. Fig. 3 is a central vertical section therethrough. Fig. 4 is a horizontal section on the line 4 L1 oi Fig. 3. Fi 5 is a partial vertical section on the line 5 5 of Fig. 6, and Fig. 6 is a top plan view ot' the cock.

The letters I-I and Ldesignate, respectively, the high and low pressure cylinders oi' a locomotive-engine. At each end oi the low-pressure cylinder is shown one o1I the cocks O, which will now be described.

A casing 10 is provided with an upper threaded extremity 1l for engagement with the correspondingly-tapped opening of the cylinder. At the opposite end the casing is threaded to receive a plug 11, in which is an axial opening. About the preferably-cylindrical sides ofthe casing are extended open ings 12, and about its upper interior portion is formed a seat 13, with which may coperate a valve 1A. This valve has an extension 15, here shown as cylindrical, and across the lower portion of the extension is a spider 16, in which is a central opening. Surrounding the casing and contacting at its lower end with the plug and at its upper end with the under side of the valve is a spring 17, which acts to normally force the valve against its seat to close the casingopening.

Through the center ot' the valve 14 is an opening surrounded by a seat 18, and rising above the seat (here shown as formed integrally with the valve) is a cage or retaining member 19, provided in its sides with openings 20 and having its top conveniently closed by a threaded plug' 21. Arms 21, radiating from the cage, may contact with the inside oi' the casing and assist in guiding the valve 111. Cooperating with the seat 18 is a valve 22, which may be guided by the contact of radial arms 23 with the interior of an annular iiange or extension 24, depending from the under side oi the valve 14C. Below these arms eX- tends a stem 25, projecting through the spideropening and also guided thereby. The cage prevents the displacement of the lastnamed valve, while the plug 21 permits the assembling of the parts.

Through the lower end ot' the valve extension 15 are opposite slots 26, and through these slots may slide the usual cylinder-cock rod 26, having the inclined operating-faces 27 27 for coaction with the stem 25 of each of the cocks. To this rod is articulated a connecting-rod 28, pivoted'at its opposite end to an arm 29, connected with the locomotive-cab through the customary rigging.

On account ot' the less ten'iperature of the steam in the low-pressure cylinder it is liable to considerable condensation previous to exhaust while the locomotive is running, and this accumulating' is liable to break the intermediate head or that of the low-pressure cyl inder; but in the presence of my invention when this accumulation has become suilicient to create a dangerous pressure the spring' 17 yields, allowing the valve 14 to be pressed from its seat and permitting the escape of the 'fluid through the side opening in the casing. At the same time the downward movement ot' said valve carries the seat from the valve 22 and furnishes an additional opening, the escape therefrom being through the openings in the spider. When the pressure falls below the tension of the spring, this element returns the valve 14 to its seat, thus closing both valves. When the engineer in starting desires to,release the water from the cylinder, it is only necessary to move the cylinder-cock rod in the usual manner. The operating-faces of this press against the lower ends of the stems 25, raising the valve 22 from its seat, the larger valve remaining in place. This opens communication with the atmosphere through the opening in the valve 17 and through the spider. Thus my invention provides a compact and efective means for-both relieving the cylinder of water through manual operation by the engineer and automatically when it accumulates excessively.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- A cylinder-cock comprising a casing, a valve movable in the casing and provided with an opening surrounded by a seat, a spring situated in the easing and serving to normally hold said valve closed, a second valve extending through the opening and ooacting with the seat, means for manually operating this latter valve, and retaining means forthe second valve carried by that first named.

In testimony whereoil I have signed my name to this specification in the presence oi' two subscribing witnesses.

CHARLES BRANDON ALVIS.

Vitnesses:

C. H. MERRILL, A. E. JAMES. 

